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Yes I have an older model bmw but I do believe the drive train is all similar. I am on this forum enough and put in my 2 cents here and there for people who need it so I'd like some help back.

Anyways, I am getting a squeal under load when the car is decelerating in gear only!
So no noises when speeding up,no noise while braking and slowing down when in neutral. The only time this loud bad pulley squeal is happening is when you are in gear, and you let go of the gas pedal while you are letting the cars rpm descend. Once you come out of gear. There is no noise.

What I've done, had the car in the air with me in it, I accelerated, let the gas pedal go, accelerated, let off the gas pedal while someone is standing under the car tryna hear it. I didn't hear it from being in the car and he barely heard anything while being under it.
He did say he heard the squeal coming from the point in between the driveshaft and diff. I put the car down to the floor. Told him to come outside and listen to the noise when the car is driving on the streets and then he says, " yea that's the slight noise i heard under the car".

Not sure if when they go bad if the squeal would be less when out of gear, but I'd expect so.

Might be csb and guibo. The driveshaft still spins when the car is moving, but in gear, under load, the csb would probably be under much more force...especially if it's bad and wiggling around.

You might be able to use my hose/stethoscope and get it above the heat shield and isolate source of sound while it's up in the air...not sure about that...though the hose should help you isolate the sound anyway through the heat shield anyway.

Check your guibo too...that you can see without removing anything.

Only other thing, maybe diff fluid is low...is it leaking at all from any of the seals, front or sides?